tests

add missing stub in av.sidedata #1156

Job	Run time
py-3.8 lib-6.1 windows-latest	3m 35s
style	14s
package-source	19s
py-3.8 lib-6.0 windows-latest	3m 26s
py-3.8 lib-6.1 ubuntu-latest	5m 23s
py-3.8 lib-5.1 windows-latest	3m 56s
py-3.8 lib-6.0 ubuntu-latest	4m 10s
py-3.8 lib-5.0 windows-latest	4m 2s
py-3.8 lib-5.1 ubuntu-latest	4m 1s
package-wheel (macos-latest, arm64)	13m 51s
py-3.8 lib-5.0 ubuntu-latest	4m 4s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 49s
package-wheel (macos-latest, x86_64)	47m 56s
py-3.8 lib-6.1 macos-latest	8m 4s
package-wheel (ubuntu-latest, aarch64)	3h 26m 16s
package-wheel (ubuntu-latest, i686)	22m 38s
package-wheel (ubuntu-latest, x86_64)	22m 21s
package-wheel (windows-latest, AMD64)	15m 43s
publish	39s
	6h 15m 27s

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